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  #21  
Old 07-16-2012
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Re: Minimum Depth For Slip?

I wouldnt dredge it per say, I would have someone that can air jet selectively. Dredging is the moving of sediment to another location which requires ALOT of permits and is usually denied. I do airjet slips but 95 percent of the time it is at a private location like a home where I can push the sediment against the bulkhead. As soon as you blow bottom into any navigable water way get ready for fines.
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  #22  
Old 07-16-2012
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Re: Minimum Depth For Slip?

Quote:
Originally Posted by BlueWaterBlair View Post
So my question is, what is the minimum amount of water you would want under your keel in your slip?
For me, I don't want to be touching bottom even at the lowest of low tides. Case in point...this past Saturday evening, we were at a function at our marina. At 21:00, my wife said "we should go out for a sail." We did go out for a couple of hours and it was wonderful. 15kts out of the South, 1-2' waves, balmy air temp, Chesapeake Bay to ourselves.

I have 5-6.5 feet in my slip. Boat draws 4 feet. If I was in a slip that only permitted me to go out (and return) during high tide, it would be a deal-breaker. We only live 1 mile from our boat so we do a lot of impromptu sailing. I want water under my keel.
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  #23  
Old 07-16-2012
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Re: Minimum Depth For Slip?

thanks for everyone's input.
i measured this morning at a negative tide, and it appears i will still have a 1 3/4 feet of water under keel.
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  #24  
Old 07-17-2012
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Re: Minimum Depth For Slip?

Quote:
Originally Posted by BlueWaterBlair View Post
thanks for everyone's input.
i measured this morning at a negative tide, and it appears i will still have a 1 3/4 feet of water under keel.
No brainer. Have fun.
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  #25  
Old 07-17-2012
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Re: Minimum Depth For Slip?

Quote:
Originally Posted by sea_hunter View Post
Bolt on keels are not designed to be loaded up on the hard. A grounding is a grounding intentional or otherwise.
Quote:
Originally Posted by Melrna View Post
Your boat shouldn't rest on the keel when on the hard. It should be resting on the pads, which are placed under the bulkheads that hold the weight of the boat. You will weaken the structural grid which the keel is bolted on, if you continue to place all the weight on it.
It seems the OP doesn't actually have a problem. Still, the blocking issue should not be allowed to stand. As one other poster stated, The weight of the boat on the hard rests on the keel. The purpose of the stands is to keep the boat upright. To quote Roland Olsson, recently retired director at Hallberg Rassy, "if your boat can't sit on the keel you should get another boat." *grin*

In my experience there are many more problems on boats that had the stands bearing too much weight than anything else on the hard other than toppling over in a storm.

Even boats like that J/22s that are very often trailered with bunks get shored up beneath the keel before being taken over the road.
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  #26  
Old 07-17-2012
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Re: Minimum Depth For Slip?

Quote:
Originally Posted by BlueWaterBlair View Post
thanks for everyone's input.
i measured this morning at a negative tide, and it appears i will still have a 1 3/4 feet of water under keel.
This morning was only about a -0.5 ft tide. Along the California coast one can expect extreme spring tides as low as about -2.0 feet, and maybe a tad lower if there is a strong high pressure system coinciding with the spring tide. So, there will be time when you'll be cutting it pretty close. But, probably 99% of the time you'll be fine.
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Old 07-17-2012
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Re: Minimum Depth For Slip?

SBS,

I am going by the printed tide table booklet that i picked up at my marina.

Is there an online source i can go to that might be more accurate for the current day, week, or month?
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  #28  
Old 07-18-2012
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Re: Minimum Depth For Slip?

The printed tables are usually just fine. They're almost all based on the same NOAA predictions and/or algorithms anyway.

My point is that the spring tides vary from month to month. Spring tides occur around the new and full moons, and are the lowest and highest tides during the lunar cycle. They are named because not for the season, but because of the strong resultant currents (the tides seem to "spring" back and forth). The most extreme spring tides tend to be those around the summer and winter solstices. For instance, we're in a spring tide series right now. Near Mission Bay the lowest tide in this particular series will be a -0.65 foot tide Thursday morning. However, the spring tides at the beginning of last month got as low as -1.92 feet. And the tides a week or so before Christmas this year will get down to -1.96 feet. Those extreme spring tides are the ones you need to worry about, rather than the "average" spring tides.

Edit:
One caveat to keep in mind is that, as an Oceanographer told me many years ago, "Tide predictions are only good to within about a half and hour and a half a foot." In other words, the weather, and simple errors in our models, can influence the actual tide enough to be off by bit. If you surf the NOAA website a bit you should be able to find a trace of the actual tidal level as compared to the prediction for any site with a NOAA "reference station". When the barometric pressure is high, it tends to push the tidal level down a bit. When the pressure is low, it tends to pull the tide up a bit. Winds also have a bit of an effect, particularly in embayments.
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Last edited by SlowButSteady; 07-18-2012 at 02:13 AM.
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  #29  
Old 07-24-2012
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Re: Minimum Depth For Slip?

SBS,

That's great information.
Thanks.
My survey is today.
Fingers crossed.
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